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|1. (WO2018018987) CALIBRATION PRE-PROCESSING METHOD FOR LIGHT FIELD CAMERA|
|Applicants:||SHENZHEN INSTITUTE OF FUTURE MEDIA TECHNOLOGY
GRADUATE SCHOOL AT SHENZHEN, TSINGHUA UNIVERSITY
|Title:||CALIBRATION PRE-PROCESSING METHOD FOR LIGHT FIELD CAMERA|
The present invention discloses a calibration pre-processing method for a light field camera. The method comprises the following steps: S1: pre-processing a white image to obtain a sub-image under respective micro-lenses; S2: providing a checkerboard grid image and aligning the checkerboard grid image with the white image pre-processed in step S1 to obtain a sub-image under a specified micro-lens; and S3: performing corner detection on each sub-image obtained in step S2. In the processing of the white image, a halo method is firstly used to determine a central point position of a micro-lens, and then the central point position of the micro-lens is optimized by means of linear fitting, utilizing the center point of a sub-image and the central points of surrounding micro-lenses. In the corner detection, Hough line detection is employed, then positions of corners are computed, and the corners are continuously and iteratively optimized by means of a self-defined index, so as to obtain a more precise coordinate position.